Christian conception of God as consisting of three persons — the Father, the Son, and the Holy Spirit — sharing the same substance
The Christian doctrine of the Trinity ( from 'threefold') is the central doctrine concerning the nature of God in most Christian churches, which defines one God existing in three coequal, coeternal, consubstantial divine persons: God the Father, God the Son (Jesus Christ) and God the Holy Spirit, three distinct persons (hypostases) sharing one essence/substance/nature (homoousion). Wikipedia